Help! I have Shimano Tiagra Flight Deck 9 speed dual shifter. While out riding, my right hand (rear derailleur) shifter simply froze with the chain on the top (largest) sprocket. No shifting possible in any direction.
You can see that the inner lever is not resting comfortably in the larger, outer lever, slightly out of alignment and with a small gap. Any thoughts about what's the issue and how to put it right?